/**
 * @description:动态立体墙材质
 * @date: 2022-02-11
 */

//动态墙材质
function DynamicWallMaterialProperty(options) {
  // 默认参数设置
  this._definitionChanged = new Cesium.Event();
  this._color = undefined;
  this._colorSubscription = undefined;
  this.color = options.color;
  this.duration = options.duration;
  this.trailImage = options.trailImage;
  this._time = (new Date()).getTime();
  
  Cesium.Material.DynamicWallType = 'DynamicWall';
  Cesium.Material.DynamicWallImage = options.image;
  Cesium.Material.DynamicWallSource = "czm_material czm_getMaterial(czm_materialInput materialInput)\n\
                                          {\n\
                                          czm_material material = czm_getDefaultMaterial(materialInput);\n\
                                          vec2 st = materialInput.st;\n\
                                          vec4 colorImage = texture2D(image, vec2(fract(st.t - time), st.t));\n\
                                          vec4 fragColor;\n\
                                          fragColor.rgb = color.rgb / 1.0;\n\
                                          fragColor = czm_gammaCorrect(fragColor);\n\
                                          material.alpha = colorImage.a * color.a;\n\
                                          material.diffuse = color.rgb;\n\
                                          material.emission = fragColor.rgb;\n\
                                          return material;\n\
                                          }";
  Cesium.Material._materialCache.addMaterial(Cesium.Material.DynamicWallType, {
    fabric: {
      type: Cesium.Material.DynamicWallType,
      uniforms: {
        color: new Cesium.Color(1.0, 1.0, 1.0, 1),
        image: Cesium.Material.DynamicWallImage,
        time: 0
      },
      source: Cesium.Material.DynamicWallSource
    },
    translucent: function (material) {
      return true;
    }
  });
}
Object.defineProperties(DynamicWallMaterialProperty.prototype, {
  isConstant: {
    get: function () {
      return false;
    }
  },
  definitionChanged: {
    get: function () {
      return this._definitionChanged;
    }
  },
  color: Cesium.createPropertyDescriptor('color')
});
DynamicWallMaterialProperty.prototype.getType = function (time) {
  return 'DynamicWall';
};
DynamicWallMaterialProperty.prototype.getValue = function (time, result) {
  if (!Cesium.defined(result)) {
    result = {};
  }
  result.color = Cesium.Property.getValueOrClonedDefault(this._color, time, Cesium.Color.WHITE, result.color);
  if (this.trailImage) {
    result.image = this.trailImage;
  } else {
    result.image = Cesium.Material.DynamicWallImage
  }

  if (this.duration) {
    result.time = (((new Date()).getTime() - this._time) % this.duration) / this.duration;
  }
  return result;
};
DynamicWallMaterialProperty.prototype.equals = function (other) {
  return this === other ||
    (other instanceof DynamicWallMaterialProperty &&
      Cesium.Property.equals(this._color, other._color))
};

Cesium.DynamicWallMaterialProperty = DynamicWallMaterialProperty;